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Searching Array

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Join Date: Apr 2009

Posts: 2

Reputation: rudolph2004 is an unknown quantity at this point

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rudolph2004 rudolph2004 is offline

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Newbie Poster

Searching Array

Apr 14th, 2009

Hi,
I have been asked to create a small programme that asks a user how many students information they would like to enter and then asks the user to enter all their information storing it all into a struct.

The above is all good I know exactly know how to do this, but then we have to ask the user to seacrh for a student record using the student ID where they are then shown the record of that particular student.
Student ID will be an element in the struct. I am not sure exactly how to go about this!
Any help would be appreciated.
Thanks

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Join Date: Sep 2008

Posts: 90

Reputation: unbeatable0 is an unknown quantity at this point

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unbeatable0 unbeatable0 is offline

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Junior Poster in Training

Re: Searching Array

Apr 14th, 2009

What about a linked list?
Or alternatively, you could store all the class instances in an array with as many elements as the the user inputs, and to check which instance has the student's ID run a loop through all the indexes.
An example to make it all clearer:

 Help with Code Tags 
 c++ Syntax (Toggle Plain Text) 
...
struct StudentInfo
{
...
unsigned int ID;
...
}
 
int main(void)
{
short int NumOfStudents;
cout<<"Input information on how many students?\n";
cin>>NumOfStudents;
StudentInfo Students[NumOfStudents];
short int Index;
   for(Index=0;Index<NumOfStudents;Index++)
   {
   ... // input students information
   }
 
unsigned int ID_ToLookFor;
cout<<"Search for a student with what ID?\n";
cin>>ID_ToLookFor;
   for(Index=0;Index<NumOfStudents;Index++)
   {
   if(Students[Index].ID==ID_ToLookFor) .. // do whatever you need to do here
   }
...
}
...
struct StudentInfo
{
...
unsigned int ID;
...
}

int main(void)
{
short int NumOfStudents;
cout<<"Input information on how many students?\n";
cin>>NumOfStudents;
StudentInfo Students[NumOfStudents];
short int Index;
   for(Index=0;Index<NumOfStudents;Index++)
   {
   ... // input students information
   }

unsigned int ID_ToLookFor;
cout<<"Search for a student with what ID?\n";
cin>>ID_ToLookFor;
   for(Index=0;Index<NumOfStudents;Index++)
   {
   if(Students[Index].ID==ID_ToLookFor) .. // do whatever you need to do here
   }
...
}